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IEEE Transactions on Energy Conversion, 2021
In the control of variable flux reluctance machine (VFRM) excited by zero-sequence current, neglecting the zero-sequence resistive voltage drop would cause a large calculation deviation of the stator voltage, which can saturate the inverter and influence the switching from constant torque region to flux-weakening region.
Xu Liu, Jiaqiang Guo, Li Shanhu
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In the control of variable flux reluctance machine (VFRM) excited by zero-sequence current, neglecting the zero-sequence resistive voltage drop would cause a large calculation deviation of the stator voltage, which can saturate the inverter and influence the switching from constant torque region to flux-weakening region.
Xu Liu, Jiaqiang Guo, Li Shanhu
exaly +2 more sources
On-Site Low Voltage Determination of Zero-Sequence Impedances for Power Transformers
IEEE Transactions on Power Delivery, 2020Accurate zero-sequence transformer data is important for correct fault analysis and protection settings. Utilities have been forced to approximate zero-sequence impedances for many three-legged core power transformers in service today that did not undergo testing for zero-sequence data at the factory before site installation. Where approximation of the
Abdelrahman A Karrar +2 more
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IEEE Journal of Emerging and Selected Topics in Power Electronics, 2021
This article introduces a capacitor-voltage-balancing method based on optimal zero-sequence voltage injection in a stacked multicell converter (SMC). The proposed method is implemented using hybrid carrier pulsewidth modulation and is capable of balancing and regulating the voltages of dc-link capacitors and floating capacitors in the topology.
Chenchen Wang, Qian Cheng, Chen Zhuo
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This article introduces a capacitor-voltage-balancing method based on optimal zero-sequence voltage injection in a stacked multicell converter (SMC). The proposed method is implemented using hybrid carrier pulsewidth modulation and is capable of balancing and regulating the voltages of dc-link capacitors and floating capacitors in the topology.
Chenchen Wang, Qian Cheng, Chen Zhuo
exaly +2 more sources
IEEE Transactions on Industrial Electronics, 2020 Negative sequence voltage affects the consequences of the presence of zero-sequence voltage in different ways under various grid fault conditions. The prime objective of the work presented in this article is to confine the point of common coupling (PCC ...
Soumya Ranjan Mohapatra +2 more
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Optimization of zero-sequence voltage compensation for zero-sequence directional elements
Electric Power Systems Research, 2021Abstract Compensating zero-sequence voltage measured is an effective measure to improve the sensitivity of zero-sequence directional overcurrent protections. However, when applied to double circuit power supply system, it may lead to misjudgment of zero-sequence directional elements.
Hao Xu +6 more
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Signal processing of zero sequence voltage technique
2007 European Conference on Power Electronics and Applications, 2007This paper deals with the implementation of the zero sequence voltage (ZSV) technique [4,7], which was exploited to determine the rotor position of the surface permanent magnet synchronous motor (SMPMSM). The method is based on the zero sequence voltage measurement, performed between the neutral point of AC machines and the mid-point of the inverter DC
STULRAJTER, M +3 more
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Lessening zero sequence effects in dynamic voltage restorers
APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems, 2008This paper puts forward an analysis of the effects of zero sequence components on power devices in particularly on the dynamic voltage restorer (DVR) and gives simulation results. It is shown that four-wire DVR do better then the traditional three-wire DVR, unbalance voltage and zero sequence components can be lessened by four-wire DVR effectively ...
Zhi Zhang +4 more
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